Here is a copy the specifications for the TL-29 as of October 27, 1943. Notice under the specifications that it refers back to the 1938 specifications which supersede the specifications for 1935.
This S card was the information the factory workers used to put together the knives, and told them what blades to put in the knife, how to face the blades what liners to use what tang stamps to use etc. it was quite specific.
I have often heard people say, and have probably even said it myself, that sometimes people would grab an old stamp and make a batch of knives with an old tang stamp. Indeed, Tom Williams himself told me that, however I don't think that was as common as some people think it was. If you look carefully at this S card for this order of TL-29s you will notice it is very specific, including the stamp to be used on the handle. If the workers followed the S card tang stamps would be correct.
Notice this order from 1952 is using Rogers board for the handle material.
Here is the back of this S card which gives additional information; some were stamped and some were not stamped.
Now in my previous post I stated that the 1946 catalog and the 1965 catalog both list the #27 electrician's knife as having rosewood handles. But now we see as early as 1952 there were military orders using Rogers board handles.
I also recall Tom telling me that Rogers board was also used on the Barlows for a while. I basically later on both the #27 and the #51, Barlow, both had Delrin handles. Exactly when the change came, I am not sure.
The age... 1950s, 60s or as much as 1976. 
The TL-29 stamp makes it military, but AR Norby was issued a non-stamped version with the same number of pins and inset bail placement while serving in Germany in 1974.?!
Good find on the blueprint, too, that kind of stuff is always valued because of the added dimension it lends to the hobby. 
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